My website sells one item. I am currently using the simple checkout button embedded on the website. Rather than having the button I would like the order form to be on the single page with a field for quantity.

At first I imagined that there would be a simple form that I could embed however it looks like that I need a full integration into my website through the Advanced Integration Method (AIM) which is much more complicated then I wanted.

I don't want integration into my website, can I do it without, and if I have to what is the cleanest and simplest way to do it?